Pernicious anemia is a vitamin B₁₂ deficiency disease that develops when people-such as those following a vegan diet-fail to consume any animal-based foods.

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Pernicious anemia is specifically caused by a deficiency in vitamin B₁₂, which is mainly found in animal-based foods. This deficiency can develop in people who follow a vegan diet if they do not consume plant-based foods fortified with vitamin B₁₂ or take supplements.

Pernicious Anemia Is a Vitamin B₁₂ Deficiency Disease That Develops